The circuit is suited for inductive sources such as a dynamic microphone, transformer or inductance sensor/pick up...
Articles and news - 9
Very simple amplifier with phantom power
PIC and AVR Microcontrollers Anchor the Majority of Embedded Designs Today
Microchip grows its commitment to the 8-bit PIC and AVR MCUs by releasing five new product families and over 60 new devices...
LEM to unveiled the world's first Integrated Current Sensor with Sigma Delta bitstream output
LEM as launched the HMSR DA, the first Integrated current sensor on the market to offer a Sigma Delta bitstream output...
Open-loop power supply delivers as much as 1 W
For VCRs, TVs, and other equipment that requires a standby mode, you must supply power to a µP when other components are asleep to receive and interpret any wake-up signal from the remote control or from the broadcasting company...
Balancing power sharing of paralleled boost converters in speakers
Audio amplifiers for high-power portable speakers such as trolley speakers usually operate with lithium-ion batteries, and these batteries can vary from a single cell to a few cells in series. Designers generally use boost converters to produce the voltage for the audio amplifier, since the speakers may consume more than a few hundred watts...
Inverted MOSFET helps 555 oscillator ignore power supply and temp variations
Since its invention over a half-century ago by Hanz Camenzind at Signetics, the familiar 555 analog timer (in league with its updated pin-compatible CMOS descendants) has become an iconic design element incorporated into useful standardized functional blocks almost too numerous to count...
Linear opto-couplers and the loop gain 'booby trap'
A power supply that I was examining used an opto-coupler in its feedback path for control of its output voltage. This is a commonplace and well established design approach, but the feedback loop’s unconditional loop stability was not altogether a certainty...
STMicroelectronics' integrated automotive audio amplifier combines high-definition sound with class-G efficiency
STMicroelectronics’ TDA7901 automotive amplifier integrates a buck controller for class-G power switching and supports high-definition audio, a market-unique combination for great listening and high efficiency...
Switching regulator efficiently controls white-LED current
A few years ago, manufacturers specified their white, but dim, LEDs for a maximum forward-current rating of 20 mA. Today's white LEDs deliver more light and thus must operate at ever-higher bias currents...
Two-wire, four-by-four-key keyboard interface saves power
You can use a microcontroller that includes an ADC to design a two-wire-plus-ground keyboard interface. For example, you can use a resistive voltage divider to identify a pressed key...
